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Drive from 2009 - Scanner says all bad but chkdsk says good


Got an old 640GB drive from a system being tossed (WD Blue) - manufactured 2009.  Obviously it's pretty small, so it's not a big concern, but I was surprised to find that Scanner started marking every sector as bad - I stopped it after something like 30,000 bad sectors. 

I ran chkdsk with the full scan and fix, and it reported no problems at all.  ( I also did a full format and again ran it through scanner - same thing.  And again chkdsk says all good).

The drive was plugged into a USB dock that I've had no previous problems with.

It also said no SMART data was available - but I assume that's just due its ancient vintage.

Are there known differences in older drives that would cause Scanner to think everything was bad? 

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